TY - JOUR
T1 - Kinetic study of hydrodeoxygenation of palmitic acid as a model compound for microalgae oil over Pt/γ-Al2O3
AU - Zhou, Lin
AU - Lawal, Adeniyi
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - The kinetics of hydrodeoxygenation (HDO) of palmitic acid over the 1% Pt/γ-Al2O3catalyst was investigated in a microreactor using integral method. Kinetic data were collected under process conditions of industrial interest but in the regime with negligible heat and mass transfer limitations. For the first time, rate equations derived from three kinetic models (Power law, Langmuir-Hinshelwood, and Eley-Rideal) were investigated in data fitting through nonlinear regression using Levenberg-Marquardt algorithm, and evaluated based on proposed statistical and thermodynamics criteria. H2was found to be adsorbed on the catalyst surface without dissociation, which is different from gaseous reaction with consistent dissociative adsorption of H2.The apparent activation energy is 60.3 kJ/mol, which is lower than the intrinsic activation energy of 92.9 kJ/mol due to the exothermic adsorption of reactants. The proposed rate equations are expected to be applicable to liquid phase HDO of fatty acids, and not limited to palmitic acid. This complete kinetic study (including rate equations with specified kinetic parameters) fills an important knowledge gap in green diesel production from algae, and can be used for rational design of reactors and the determination of optimum operating conditions. Moreover, the presented work develops a systematic procedure for kinetic study by identifying the challenges that need to be overcome to obtain meaningful kinetic data.
AB - The kinetics of hydrodeoxygenation (HDO) of palmitic acid over the 1% Pt/γ-Al2O3catalyst was investigated in a microreactor using integral method. Kinetic data were collected under process conditions of industrial interest but in the regime with negligible heat and mass transfer limitations. For the first time, rate equations derived from three kinetic models (Power law, Langmuir-Hinshelwood, and Eley-Rideal) were investigated in data fitting through nonlinear regression using Levenberg-Marquardt algorithm, and evaluated based on proposed statistical and thermodynamics criteria. H2was found to be adsorbed on the catalyst surface without dissociation, which is different from gaseous reaction with consistent dissociative adsorption of H2.The apparent activation energy is 60.3 kJ/mol, which is lower than the intrinsic activation energy of 92.9 kJ/mol due to the exothermic adsorption of reactants. The proposed rate equations are expected to be applicable to liquid phase HDO of fatty acids, and not limited to palmitic acid. This complete kinetic study (including rate equations with specified kinetic parameters) fills an important knowledge gap in green diesel production from algae, and can be used for rational design of reactors and the determination of optimum operating conditions. Moreover, the presented work develops a systematic procedure for kinetic study by identifying the challenges that need to be overcome to obtain meaningful kinetic data.
KW - Eley-Rideal
KW - Hydrodeoxygenation (HDO)
KW - Kinetic study
KW - Langmuir-Hinshelwood
KW - Microalgae oil
KW - Power law
KW - Pt/AlO
UR - http://www.scopus.com/inward/record.url?scp=85006993971&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85006993971&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2016.12.014
DO - 10.1016/j.apcata.2016.12.014
M3 - Article
AN - SCOPUS:85006993971
SN - 0926-860X
VL - 532
SP - 40
EP - 49
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
ER -